please help low coolant light

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Jul 23, 2009 | 08:05 PM

#16

dragginS10

Thread Starter

Registered User

Joined: Jun 2009

Posts: 189

From: long island NY

Quote:

Originally Posted by Injuneer

P0420 sets when the Bank 1 after-cat O2 sensor voltage swings approach 90% of the pre-cat sensor voltage swings. Swap the two after-cat O2 sensors side to side. If the problem follows the sensor (P0430) its a faulty sensor. If the problem stays on Bank 1, its one of the other 3 causes.

so if after i switch them and the SES light is still on then that means my sensor is bad?

Jul 23, 2009 | 09:36 PM

#17

Injuneer

Administrator

Joined: Nov 1998

Posts: 71,110

From: Hell was full so they sent me to NJ

Quote:

Originally Posted by dragginS10

so if after i switch them and the SES light is still on then that means my sensor is bad?

No.

If you swap them, and the SES light stays on, it could be because you have P0420 or P0430, so it won't tell you anything. As I indicated already, you have to read the code to see where the problem is.